From: Will Deacon <will@kernel.org> mainline inclusion from mainline-v6.12-rc1 commit e7bafbf7177750e6643941473b343ed72fc5a100 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IBWQ24 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- Implementing the internal mem_encrypt API for arm64 depends entirely on the Confidential Computing environment in which the kernel is running. Introduce a simple dispatcher so that backend hooks can be registered depending upon the environment in which the kernel finds itself. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Steven Price <steven.price@arm.com> Acked-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20240830130150.8568-4-will@kernel.org Signed-off-by: Will Deacon <will@kernel.org> Conflicts: arch/arm64/Kconfig arch/arm64/include/asm/set_memory.h [Only context conflicts] Signed-off-by: Cai Xinchen <caixinchen1@huawei.com> --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/mem_encrypt.h | 15 +++++++++ arch/arm64/include/asm/set_memory.h | 1 + arch/arm64/mm/Makefile | 2 +- arch/arm64/mm/mem_encrypt.c | 50 ++++++++++++++++++++++++++++ 5 files changed, 68 insertions(+), 1 deletion(-) create mode 100644 arch/arm64/include/asm/mem_encrypt.h create mode 100644 arch/arm64/mm/mem_encrypt.c diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 6d9def7a9c02..ced1c898f479 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -33,6 +33,7 @@ config ARM64 select ARCH_HAS_KCOV select ARCH_HAS_KEEPINITRD select ARCH_HAS_MEMBARRIER_SYNC_CORE + select ARCH_HAS_MEM_ENCRYPT select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_NONLEAF_PMD_YOUNG if ARM64_HAFT diff --git a/arch/arm64/include/asm/mem_encrypt.h b/arch/arm64/include/asm/mem_encrypt.h new file mode 100644 index 000000000000..b0c9a86b13a4 --- /dev/null +++ b/arch/arm64/include/asm/mem_encrypt.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __ASM_MEM_ENCRYPT_H +#define __ASM_MEM_ENCRYPT_H + +struct arm64_mem_crypt_ops { + int (*encrypt)(unsigned long addr, int numpages); + int (*decrypt)(unsigned long addr, int numpages); +}; + +int arm64_mem_crypt_ops_register(const struct arm64_mem_crypt_ops *ops); + +int set_memory_encrypted(unsigned long addr, int numpages); +int set_memory_decrypted(unsigned long addr, int numpages); + +#endif /* __ASM_MEM_ENCRYPT_H */ diff --git a/arch/arm64/include/asm/set_memory.h b/arch/arm64/include/asm/set_memory.h index 2031b31c05f9..2a13bdc90a95 100644 --- a/arch/arm64/include/asm/set_memory.h +++ b/arch/arm64/include/asm/set_memory.h @@ -3,6 +3,7 @@ #ifndef _ASM_ARM64_SET_MEMORY_H #define _ASM_ARM64_SET_MEMORY_H +#include <asm/mem_encrypt.h> #include <asm-generic/set_memory.h> #include <asm/virtcca_cvm_guest.h> diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile index 60454256945b..2fc8c6dd0407 100644 --- a/arch/arm64/mm/Makefile +++ b/arch/arm64/mm/Makefile @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-y := dma-mapping.o extable.o fault.o init.o \ cache.o copypage.o flush.o \ - ioremap.o mmap.o pgd.o mmu.o \ + ioremap.o mmap.o pgd.o mem_encrypt.o mmu.o \ context.o proc.o pageattr.o fixmap.o obj-$(CONFIG_ARM64_CONTPTE) += contpte.o obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o diff --git a/arch/arm64/mm/mem_encrypt.c b/arch/arm64/mm/mem_encrypt.c new file mode 100644 index 000000000000..ee3c0ab04384 --- /dev/null +++ b/arch/arm64/mm/mem_encrypt.c @@ -0,0 +1,50 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Implementation of the memory encryption/decryption API. + * + * Since the low-level details of the operation depend on the + * Confidential Computing environment (e.g. pKVM, CCA, ...), this just + * acts as a top-level dispatcher to whatever hooks may have been + * registered. + * + * Author: Will Deacon <will@kernel.org> + * Copyright (C) 2024 Google LLC + * + * "Hello, boils and ghouls!" + */ + +#include <linux/bug.h> +#include <linux/compiler.h> +#include <linux/err.h> +#include <linux/mm.h> + +#include <asm/mem_encrypt.h> + +static const struct arm64_mem_crypt_ops *crypt_ops; + +int arm64_mem_crypt_ops_register(const struct arm64_mem_crypt_ops *ops) +{ + if (WARN_ON(crypt_ops)) + return -EBUSY; + + crypt_ops = ops; + return 0; +} + +int set_memory_encrypted(unsigned long addr, int numpages) +{ + if (likely(!crypt_ops) || WARN_ON(!PAGE_ALIGNED(addr))) + return 0; + + return crypt_ops->encrypt(addr, numpages); +} +EXPORT_SYMBOL_GPL(set_memory_encrypted); + +int set_memory_decrypted(unsigned long addr, int numpages) +{ + if (likely(!crypt_ops) || WARN_ON(!PAGE_ALIGNED(addr))) + return 0; + + return crypt_ops->decrypt(addr, numpages); +} +EXPORT_SYMBOL_GPL(set_memory_decrypted); -- 2.18.0.huawei.25